Halogenation of Alkenes Reaction occurs through an intermediate bromonium ion (R2Br+),formed by interaction of the alkene with Br2 and simultaneous loss of Br Br: :Br: CC ---C- :Br: An alkene A bromonium ionReaction occurs through an intermediate bromonium ion (R2Br+), formed by interaction of the alkene with Br2 and simultaneous loss of Br￾Halogenation of Alkenes